Influence of Processing Parameters on Atmospheric Pressure Plasma Etching of Polyvinyl Alcohol Films

2011 ◽  
Vol 299-300 ◽  
pp. 608-611
Author(s):  
Shu Jing Peng ◽  
Yi Ping Qiu
Keyword(s):  
Atmospheric Pressure ◽  
Treatment Time ◽  
Etching Rate ◽  
Atmospheric Pressure Plasma ◽  
Processing Parameters ◽  
Moisture Regain ◽  
Force Microscopy ◽  
Pressure Plasma ◽  
Atomic Force ◽  
Negative Effect

This paper investigated the influence of various processing parameters of atmospheric pressure plasma jet (APPJ) on the etching behavior of PVA films. The etching rate increased as output power, and moisture regain increased. As the treatment time increased, the etching rate increased initially and then decreased. Atomic force microscopy (AFM) results showed that the surface roughness varied as the moisture regain (MR) (2.45%, 9.32%, and 78.31%, respectively) of PVA films changed during APPJ treatment. It was found that higher moisture regain and lower thermal conduction of underlayer had negative effect on the solubility of plasma treated PVA films.

Surface Modification of Polypropylene by Atmospheric Pressure Plasma

2021 ◽  
Vol 8 (2) ◽  
pp. 97-104
Author(s):  
O. Xosocotla ◽  
H. Martinez ◽  
B. Campillo
Keyword(s):  
Plasma Treatment ◽  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Plasma Source ◽  
Attenuated Total Reflection ◽  
Polar Component ◽  
Force Microscopy ◽  
Pressure Plasma ◽  
Atomic Force ◽  
Before And After

In this investigation, we studied the influence of atmospheric pressure plasma treatment on the surface properties of polypropylene (PP). The PP samples were treated for various durations using a gliding arc plasma source with air as a working gas. The formation of polar groups (–OH and C = O) on the PP surface after plasma treatment was evaluated and analyzed using Raman spectroscopy and attenuated total reflection–Fourier transform infrared spectroscopy. The contact angle was measured using polar and non-polar liquids to obtain the polar and dispersive components as well as the surface free energy of the PP before and after treatment. A sevenfold increase after treatment was observed for the polar component, while hydrophobicity decreased 73% after treatment. Finally, changes in topography were observed using atomic force microscopy (AFM) analysis before and after plasma treatment. AFM images showed that under atmospheric treatment, the PP surface underwent etching, reducing the surface roughness. Microhardness measurements of the films also revealed significant changes in mechanical properties after plasma treatment.

Effect of gas type and application distance on atmospheric pressure plasma jet-treated flax composites

2017 ◽  
Vol 36 (17) ◽  
pp. 1197-1210 ◽  
Author(s):  
Umit Huner ◽  
Haci Ali Gulec ◽  
Irem Damar Huner
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jet ◽  
Atmospheric Pressure Plasma Jet ◽  
Force Microscopy ◽  
Pressure Plasma ◽  
Atomic Force ◽  
Scanning Electron

This study reports on the effect of atmospheric pressure plasma jet treatment on the flax fiber and flax-reinforced epoxy. The atmospheric pressure plasma jet was carried out by using four different gasses and various application distance in the range of 30–40 mm. The treatments were investigated by means of contact angle, attenuated total reflectance–Fourier transform infrared spectroscopy, atomic force microscopy, scanning electron microscopy and mechanical tests. Depending on the application parameters, the rate of increase in water contact angle varied from 49% to 92%. While atomic force microscopy and scanning electron microscopy investigations exhibited changed surface morphology, FTIR presented interactions at the molecular level. Improvement in mechanical properties was obtained for all atmospheric pressure plasma jet applications, while the increase in tensile strength in the composite material reached 180%, and the increase in flexural strength was 140%. The atmospheric pressure plasma jet method, according to similar plasma applications, came to the forefront with the short processing time and the intensity of the effect it created.

scholarly journals Adhesion between Epoxy Resin-Based Fiber Post and Dental Core Resin Improved by Non-Thermal Atmospheric Pressure Plasma

2020 ◽  
Vol 10 (7) ◽  
pp. 2535
Author(s):  
Hyoung-Sik Kim ◽  
Song-Yi Yang ◽  
Eun Ha Choi ◽  
Kwang-Mahn Kim ◽  
Jae-Sung Kwon
Keyword(s):  
Contact Angle ◽  
Bond Strength ◽  
Epoxy Resin ◽  
Atmospheric Pressure ◽  
Shear Bond Strength ◽  
Treatment Time ◽  
Atmospheric Pressure Plasma ◽  
Fiber Post ◽  
Pressure Plasma ◽  
Push Out

The purpose of the study was to evaluate the adhesion between dental core resin and epoxy resin-based fiber post after treatment with non-thermal atmospheric pressure plasma (NTAPP) and compare with conventional methods of epoxy resin-based fiber post treatments. Contact angle was measured on the surface of epoxy resin before and after NTAPP treatment and X-ray photoelectron spectroscopy was used to analyze the surface chemistry. Finally, two shear bond strength tests were carried out; shear bond strength between core resin and epoxy resin for comparison between NTAPP treated and untreated sample, and push-out shear bond strength between core resin and NTAPP treated commercially available epoxy resin-based fiber post for comparison between NTAPP treated samples with conventionally treated samples. Contact angle on the surface of epoxy resin generally decreased with increasing NTAPP treatment time with presence of surface chemical changes. Also, there was significantly higher shear bond strength and push-out shear bond strength between epoxy resin and core resin for NTAPP treated epoxy resin, even to the conventionally treated epoxy resin-based fiber post with hydrofluoric acid or silane. In conclusion, new technology of NTAPP has potential for application on the epoxy resin-based fiber post to improve endodontic restoration success rate.

Modeling the Inactivation of Bacillus cereus in Tiger Nut Milk Treated with Cold Atmospheric Pressure Plasma

2019 ◽  
Vol 82 (11) ◽  
pp. 1828-1836 ◽  
Author(s):  
ALIYU IDRIS MUHAMMAD ◽  
RUILING LV ◽  
XINYU LIAO ◽  
WEIJUN CHEN ◽  
DONGHONG LIU ◽  
...  
Keyword(s):  
Bacillus Cereus ◽  
Atmospheric Pressure ◽  
Treatment Time ◽  
Atmospheric Pressure Plasma ◽  
Titratable Acidity ◽  
Weibull Model ◽  
Input Power ◽  
Inactivation Kinetics ◽  
Pressure Plasma ◽  
Cold Atmospheric Pressure Plasma

ABSTRACT The impact of cold atmospheric pressure plasma treatment on the inactivation kinetics of Bacillus cereus ATCC 14579 and the resulting quality changes was investigated in tiger nut (Cyperus esculentus L.) milk (TNM). The effect of input power (39, 43, and 46 W) and treatment time (0 to 270 s) was fitted using the Weibull model to represent the microbial kinetic inactivation in the treated TNM. Inactivation efficacy increased with an increase in treatment time and input power. A 5.28-log reduction was achieved at 39 to 46 W without significant changes in titratable acidity, whereas no reduction in titratable acidity was observed in the pasteurized sample. The inactivation kinetics was adequately described by the Weibull model. Higher input power of 43 and 46 W and 120 s of treatment resulted in marked decreases in pH, flavonoid concentration, and antioxidant activity compared with those parameters in pasteurized TNM. Increases in total color difference and phenolic concentrations also were observed. The results indicate that these changes were caused by the immanent plasma reactive species. This study provides valuable inactivation kinetics information for food safety assessment studies of B. cereus vegetative cells in TNM.

Simple Fabrication of Superhydrophobic Surfaces Using Atmospheric-Pressure Plasma

2018 ◽  
Vol 941 ◽  
pp. 1808-1814 ◽  
Author(s):  
Elham Vazirinasab ◽  
Reza Jafari ◽  
Gelareh Momen ◽  
Tony Carreira
Keyword(s):  
Chemical Composition ◽  
Plasma Treatment ◽  
Silicone Rubber ◽  
Atmospheric Pressure ◽  
Chemical Characterization ◽  
Atmospheric Pressure Plasma ◽  
Processing Parameters ◽  
Superhydrophobic Surfaces ◽  
Pressure Plasma ◽  
Number Of Passes

Nature-inspired superhydrophobic surfaces have received immense industrial and academic interest due to their non-wettability and self-cleaning properties. To fabricate superhydrophobic silicone rubber surfaces, a simple, environmentally friendly atmospheric-pressure plasma treatment was applied. The effect of diverse plasma processing parameters on the final wettability behavior of the substrates, including plasma power, plasma frequency, number of passes, plasma jet speed, plasma cycle time and distance between the nuzzle outlet and substrate, were analyzed by means of design of experiments (DoE). Surface chemical characterization illustrated the influence of plasma treatment on the chemical composition of the produced silicone rubber. Furthermore, the presence of microstructures as well as the chemical composition of the surface was confirmed using scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy analysis.

Influence of Atmospheric-Pressure Plasma Treatment on Surface of Polyimide Film

2007 ◽  
Vol 119 ◽  
pp. 123-126
Author(s):  
Soo Jin Park ◽  
Eun Jung Lee ◽  
Soo Han Kwon
Keyword(s):  
Plasma Treatment ◽  
Atmospheric Pressure ◽  
Treatment Time ◽  
Fluorine Content ◽  
Atmospheric Pressure Plasma ◽  
Polyimide Film ◽  
Dielectric Constants ◽  
Unit Surface Area ◽  
Free Energies ◽  
Pressure Plasma

In this work, the effects of atmospheric-pressure plasma treatment of polyimide films on surface and dielectric characteristics were studied by using X-ray photoelectron spectroscopy (XPS), surface free energies, and dielectric spectrometer. The total surface free energies and dielectric constants of plasma treated polyimide film were deareased with increasing the treatment time, which was mainly due to a lower London-dispersive component, while the specific component was increased. This could be attributed to an increase of the polar fluorine groups of polyimide per unit surface area. And the fluorine content of the polyimide film was increased with increasing the amount of the treatment time, resulting in decreasing dielectric constant of the film. It was found that the replacement of fluorine led to the decrease of the local electronic polarizability of polyimide, or to the increase of the free volume, which could be attributed to the relatively large volume of fluorine.

scholarly journals Development of a Multihole Atmospheric Plasma Jet for Growth Rate Enhancement of Broccoli Seeds

Processes ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 1134
Author(s):  
Khattiya Srakaew ◽  
Artit Chingsungnoen ◽  
Waraporn Sutthisa ◽  
Anthika Lakhonchai ◽  
Phitsanu Poolcharuansin ◽  
...  
Keyword(s):  
Growth Rate ◽  
Atmospheric Pressure ◽  
Seed Treatment ◽  
Treatment Time ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jet ◽  
Atmospheric Plasma ◽  
Atmospheric Pressure Plasma Jet ◽  
Pressure Plasma ◽  
Significant Difference

This work aims to develop a multihole atmospheric pressure plasma jet (APPJ) device to increase the plasma area and apply it to a continuous seed treatment system. Broccoli seed was used to study the effects of an atmospheric pressure plasma jet on seed germination and growth rate. An argon flow rate of 4.2 lpm, a plasma power of 412 W, and discharge frequency of 76 kHz were used for seed treatment. The contact angle decreased strongly with the increase in treatment time from 20 s to 80 s. The broccoli seed’s outer surface morphology seemed to have been slightly modified to a smoother surface by the plasma treatment during the treatment time of 80 s. However, the cross-sectional images resulted from Synchrotron radiation X-ray tomographic microscopy (SRXTM) confirmed no significant difference between seeds untreated and treated by plasma for 80 s. This result indicates that plasma does not affect the bulk characteristics of the seed but does provide delicate changes to the top thin layer on the seed surface. After seven days of cultivation, the seed treated by plasma for 30 s achieved the highest germination and yield.

scholarly journals Cold Atmospheric Pressure Argon Plasma Jet Assisted Degradation of Malachite Green (MG) Aqueous Solution

2020 ◽  
Vol 2 (1) ◽  
pp. 51-61
Author(s):  
Vasu D ◽  
Ramkumar M.C ◽  
Arunkumar A ◽  
Navaneetha Pandiyaraj K
Keyword(s):  
Aqueous Solution ◽  
Plasma Treatment ◽  
Malachite Green ◽  
Atmospheric Pressure ◽  
Treatment Time ◽  
Oxidative Degradation ◽  
Atmospheric Pressure Plasma ◽  
Pressure Plasma ◽  
Plasma Treatment Time ◽  
Cold Atmospheric Pressure Plasma

The oxidative degradation of cold atmospheric pressure plasma assisted degradation of malachite Green (MG) was investigated in this study. Cold atmospheric pressure plasma assisted MG degradation process was carried out as a function various plasma treatment time (05, 10, and 15 mins). The % of degradation and presence carbon content in the plasma treated MG was examined by UV-Visible spectroscopy (UV-Vis) and total organic carbon (TOC) analyzer. Optical emission spectrometer was used to identify formation of various reactive species during in situ plasma treatment. The higher degradation percentage of 90% was obtained after plasma treatment time of 15 min and value of TOC also found to decreased significantly with increasing plasma treatment time.  Toxicity of the plasma-treated MG aqueous solution samples was also examined by Staphylococcus aureus (S.aureus) bacteria.

Surface Quality Prediction of Atmospheric Pressure Plasma Arc Cleaning Based on Least Square Support Vector Machine

2013 ◽  
Vol 813 ◽  
pp. 460-464
Author(s):  
Zhan Min Yin ◽  
Xiao Juan Dong ◽  
Jian Bing Meng
Keyword(s):  
Surface Quality ◽  
Atmospheric Pressure ◽  
Orthogonal Experiment ◽  
Atmospheric Pressure Plasma ◽  
Processing Parameters ◽  
Least Square ◽  
Support Vector ◽  
Plasma Arc ◽  
Water Contact ◽  
Pressure Plasma

The theory of Least Squares Support Vector Machines was applied to metal surfaces cleaning by atmospheric pressure plasma arc. An intelligent predictive model of the non-linear relationship between cleaning quality and process parameters was established with the k-fold cross training of sample data. An orthogonal experiment was conducted to assess the effect of processing parameters on surface quality. The experimental results and predicted values show that the atmospheric pressure plasma arc (APPA) cleaning is effective in reducing considerably the amount of lubricant. Furthermore, it is feasible to apply LS-SVM in forecasting the cleaning quality and determining processing parameters, and the mean absolute percent error eMAPE between predictive value and experimental value of water contact angle is 6.09%. Otherwise, the eMAPE of working current is 4.46%.

scholarly journals Effects of Pre-Treatment Using Plasma on the Antibacterial Activity of Mushroom Surfaces

Foods ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 1888
Author(s):  
Sarmistha Mitra ◽  
Mayura Veerana ◽  
Eun-Ha Choi ◽  
Gyungsoon Park
Keyword(s):  
Lipid Peroxidation ◽  
Atmospheric Pressure ◽  
Treatment Time ◽  
Reduction Rate ◽  
Atmospheric Pressure Plasma ◽  
Bacterial Attachment ◽  
Pressure Plasma ◽  
Attached Bacteria ◽  
Pre Treatment

Although non-thermal atmospheric pressure plasma is an efficient tool for preventing post-harvest microbial contamination, many studies have focused on the post-treatment of infected or contaminated foods. In this study, we examined the antimicrobial quality of mushrooms pre-treated with a non-thermal atmospheric pressure plasma jet (NTAPPJ) or plasma-treated water (PTW). The CFU (Colony Forming Unit) number of Escherichia coli inoculated on surfaces of mushrooms pre-treated with NTAPPJ or PTW was significantly reduced (about 60–75% for NTAPPJ and about 35–85% for PTW), and the reduction rate was proportional to the treatment time. Bacterial attachment and viability of the attached bacteria were decreased on NTAPPJ-treated mushroom surfaces. This may be caused by the increased hydrophilicity and oxidizing capacity observed on NTAPPJ-treated mushroom surfaces. In PTW-treated mushrooms, bacterial attachment was not significantly changed, but death and lipid peroxidation of the attached bacteria were significantly increased. Analysis of mushroom quality showed that loss of water content was greater in mushrooms treated with NTAPPJ compared to that in those with no treatment (control) and PTW treatment during storage. Our results suggest that pre-treatment with NTAPPJ or PTW can improve the antibacterial quality of mushroom surfaces by decreasing bacterial attachment (for NTAPPJ) and increasing bacterial lipid peroxidation (for both NTAPPJ and PTW).

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